v3.26.1
FAIR VALUE MEASUREMENTS - Fair Value of Other Temporary Investments and Cash (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair Value $ 5,241 $ 4,916
Total Other Temporary Investments and Restricted Cash    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cost 271 264
Gross Unrealized Gains 32 29
Gross Unrealized Losses (3) (2)
Fair Value 300 291
Restricted Cash    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cost 72 71
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 72 71
Other Cash Deposits    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cost 10 13
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 10 13
Fixed Income Securities – Mutual Funds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cost 176 167
Gross Unrealized Gains 0 0
Gross Unrealized Losses (3) (2)
Fair Value 173 165
Equity Securities – Mutual Funds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cost 13 13
Gross Unrealized Gains 32 29
Gross Unrealized Losses 0 0
Fair Value $ 45 $ 42